Dr. Sergio DeSouza-Machado obtained a B.A. in Math/Physics from the College of Wooster, OH in 1988. He then attended graduate school at the University of Maryland at College Park, where he obtained his M.S. in 1990 and Ph.D. in Plasma Physics in 1996. After this, he joined the Atmospheric Spectroscopy Laboratory at the University of Maryland, Baltimore County in September 1996. He has developed kCARTA, a package that rapidly computes monochromatic absorption spectra, radiances and jacobians, and does scattering and NonLTE computations. In addition, he has developed a line-by-line code that includes CO2 P/R linemixing and water continuum corrections. His current research work is on retrievals of dust heights and optical depths, and trace gas retrievals.